From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
List of weight changes for the 40/50HP chassis from 1923 to 1927, detailing the reasons for the modifications.
| Identifier | ExFiles\Box 71\2\ scan0180 | |
| Date | 7th February 1927 | |
| 40/50HP Chassis. Date. Weight. Reason. MX{John H Maddocks - Chief Proving Officer}/MCM4/T/7.2.27 X4538 Handwritten above 'Weight': 49840 Jan.1923. 3795 lbs. Jan 1924. 3820 lbs. Hartford Shock Absorbers. Torque Reaction dampers Higher Radiator etc. Side petrol filler. Telegauge. Gaiters. Oct 1924. 4025 lbs. F.W.B. Sept.1925. 4255 lbs. New PhantomCodename for PHANTOM I. Feb.1927. 4183 lbs. 20 gallon petrol tank. W.B.W. Lightened front axle. Handwritten calculation on left: 4183 3795 --- 388 Handwritten initials at bottom: Mx{John H Maddocks - Chief Proving Officer}/McM | ||